[issue10311] Signal handlers must preserve errno

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

This is a good idea IMO. It would be better if you minimized style changes, so that the patch is easier to review.
Also, is the while loop around write() necessary here?

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nosy: +exarkun, loewis, pitrou
stage:  -> patch review
versions: +Python 2.7, Python 3.1

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